Prime Minister Julia Gillard insists she gave her "best recollection" of events surrounding a home loan involving her former partner when she was interviewed about the matter in 1995.

The home had been purchased by former union official Ralph Blewitt in 1993 and was rented out by Ms Gillard's then boyfriend and former Australian Workers Union official Bruce Wilson.

Part of the house was allegedly paid for by a union slush fund Ms Gillard had helped to establish while working as a lawyer at Slater and Gordon.

Ms Gillard has consistently denied any wrongdoing, saying she was under the impression the fund would be used for legitimate purposes, namely to support the re-election of union officials.

On last night's 7.30 program, a former equity partner at Slater and Gordon claimed he had documents which proved a discrepancy in Ms Gillard's story over when she knew about the home loan.

Nick Styant-Browne said that during an internal interview in 1995, Ms Gillard claimed she only found out about the mortgage a month earlier.

However, he says there is a Commonwealth Bank fax regarding the property that was sent to Ms Gillard in 1993.

"What I can say is this: that there is absolutely no doubt that Ms Gillard not only knew of the Slater & Gordon mortgage in March of 1993, but was specifically involved in taking steps to facilitate that mortgage," Mr Styant-Browne said.

Ms Gillard today responded to the latest claims, describing them as part of a long-running smear campaign against her.

"What this boils down to is that 17 years ago I couldn't recall events that happened two-and-a-half years earlier - that's what it boils down to," she told reporters in Melbourne.

"The event I couldn't recall, the matter I couldn't recall, related to Slater and Gordon issuing a mortgage, not a matter associated with any union fund or account.

"We've had 20 years of this, we've had a campaign of smear and innuendo and it all boils down to absolutely nothing.

"There has not been one substantiated allegation of wrongdoing put against me across the full 20 years and the whole campaign of smear."

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Asked by journalists whether it was possible she did in fact see the Commonwealth Bank document referred to by Mr Styant-Browne, Ms Gillard urged journalists to apply some common sense to the question.

"Seventeen years ago, I gave my best recollection of events that happened two-and-a-half years earlier," she said.

"This wasn't a file that I ran, I was not the partner in charge of it, I was not the solicitor operating it, and so I don't think that it's remarkable in any way that I wouldn't have full recall of documents that were on a file that I didn't run as a solicitor."

Ms Gillard then challenged reporters to explain the relevance of their questions, suggesting the issue did not justify the amount of media interest it had generated.

"Are you going to say to me that you've hopped in your cars and driven from the CBD of Melbourne 30-odd kilometres over the West Gate Bridge, and you haven't got any questions about jobs, or the future of the Australian economy, or the future of health care?"

Questions

The Coalition has repeatedly called on Ms Gillard to give a detailed account of her side of the story, suggesting she still has questions to answer about the union slush fund.

Asked to detail what exactly the Prime Minister still needs to explain, Opposition Leader Tony Abbott responded: "I think anyone who has been listening to Parliament over the last few weeks, anyone who has been listening to the ABC's 7.30 report for instance over the last couple of nights, would know that there are a lot of questions that have been put to the Prime Minister and the Prime Minister has simply been stonewalling them.

"Now, I think that all of us are more than ready to give the Prime Minister the benefit of the doubt, but in order to give her the benefit of the doubt we've got to hear her side of the story."

The Coalition is vowing to continue pursuing the matter when Parliament resumes on Monday for the last sitting week of the year.

Lawyers acting for Mr Blewitt say he has handed over documents to Victoria Police.

The former union official, who flew into Australia from Malaysia this week, had earlier said he would consider making a statement to police if he was offered immunity from prosecution.

Melbourne lawyers Galbally Rolfe said in a statement Mr Blewitt had provided documents to Victoria Police and would cooperate with their investigation.